Good masterclass videos, preferably ones related to 20th century works?

As part of my recital for my A2 exams I have to have a 20 minute viva voce with the examiner. Part of this is preprepared through related listening, as I am performing a relatively obscure piece (Jean Hubeau's trumpet sonata) I am trying to get by on things that relate even loosely to this piece. So far I had found a masterclass with Hardenberger where he goes through 20th century works however the full version has been removed from youtube. If anyone could share some insight on this the help would be much appriciated. Thanks in advance.